The Stability and Thermal Conductivity of Cobalt Nano fluids in Base Liquid Water and Glycerol Mixture
T. Rajendra Prasad1, K. Rama Krishna2, K. V. Sharma3

1T. Rajendra Prrasad, Resarch Scholar, Center for Energy Studies, JNTUH COE, Hyderabad, T.S, India.
2K. Rama Krishna, Mechanical Engineering Department, KLEF, Vaddeswaram, Guntur, India.
3K. V. Sharma, Center for Energy Studies, JNTUH COE, Hyderabad, T.S, India.

Manuscript received on 07 August 2019. | Revised Manuscript received on 14 August 2019. | Manuscript published on 30 September 2019. | PP: 8875-8880 | Volume-8 Issue-3 September 2019 | Retrieval Number: C6676098319/2019©BEIESP | DOI: 10.35940/ijrte.C6676.098319

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Abstract: The present work involves in determination of a suitable ratio of glycerol-water (GW) mixture for the preparation of nanofluid. The base liquid with 30% weight of glycerol is selected, based on the thermo-physical properties for dispersion of spherical cobalt (Co) nanoparticles of 80nm size, for a maximum concentration of 2% by weight. The stability investigation of prepared nanofluids is done by measuring Zeta potential and SEM imaging. The prepared cobalt nanofluid thermal conductivity is measured by maintaining 7.5pH as that concerned value has maximum Zeta potential. The maximum increment in thermal conductivity is found to be 38.4% for 2% nanofluid concentration is determined at a temperature of 60oC. The data obtained for the base liquid are in fine concurrence with the published data.
Keywords: Water and Glycerol Mixture; Stability; Zeta Potential; SEM Analysis; Thermal Conductivity.

Scope of the Article:
Thermal Engineering